Malicious PDF — malware analysis report

Static analysis result for SHA-256 630c00442a6a8a30…

MALICIOUS

PDF

94.2 KB Created: 2021-08-22 02:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14f80e476025b4df8eccd267ac6bfa66 SHA-1: 9628cf00aa3bd7c1f19f77e4dbe1952987c88ab0 SHA-256: 630c00442a6a8a30f8aa45ed4e7240f560a6ca2d1dafefe87e01b794c4637782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607654257b3c0---98275001995.pdf In PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/60740568578.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/55453300372.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6b3b8e30a---11449130426.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/wanunokuxasabedibo.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/32443641717.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/81a6dqgniv3svgdcatsdtvs77u/75024762153.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/20637319843.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/bodifedinekugukab.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/amm1hdeoh1e4rtrktar44i8o82/zunapifeza.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d7cee21fa---lejiro.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210730213341.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c2b507ddb3f6de8b3a295f1c18ba7ffe/tufafiloguwujimojorujud.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3ed84fb53b88e5e10f64e3a084cf735e/11827167745.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zijab.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/kelinozuvutivikakupi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12c75a9b5e1c4950963f6cd5a270493a/fumeronofowopofugijasaki.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/c8a0sglhn8m0sjvvcb8bgov7e6/45382701798.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/49237478835.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/65542859946.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/69597664483.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/2267986193.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/kifufixufuse.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/8876683cdf67263b9511fb090300ef2c/rosefuduvavejenamezorakon.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210720_44CC624EE93064D2.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/62924235760.pdfIn PDF document text
    • https://kawanmto.net/contents//files/voruwokobap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ashita+sekai+ga+owaru+toshitemo+movie+sub+indoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 11116 bytes
SHA-256: a5c750c89594d82800f46d52d01933de76d38d6758381870360d314b2b0c909e
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 10384 bytes
SHA-256: 299cf3de4bcaec86501bfe569850fa5870396b8351a21725f42bce09ff0bacc6
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 17116 bytes
SHA-256: 5c9841326fff51ba57d35e132009fdbe254a694552780a1cb3ab1f246ae9eb8c
font_03_sfnt_off00015114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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